Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e6ee47b1ccdfb4…

MALICIOUS

PDF

96.5 KB Created: 2021-07-09 05:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: baa652a5a242c5ae5d1dca45fafaff8c SHA-1: 17e4e05fc04d5504c18502ec31f7b49dfa0f2e2e SHA-256: e9e6ee47b1ccdfb4bc6d61423b1af2ab0d1623d95ebbc2e89a5b38bbf882f363
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting. The presence of multiple PDF files hosted on these domains suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://aadhaarretail.com/administrator/imagetemp/file/vegilojosufus.pdf In PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5a3bc28c0---31854819280.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/145da2f8bca38c22d5cd8a82eed8f500/gerelaza.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb852b2353---tujozikulopagadalal.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/9398e5e05239e0b47ad637aa215359f8/kerivifixiwatiwan.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/jhu4lvfpct1i5atjtk2fujm061/goniruketumozumavowo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/83780734667.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c842613c73---karotumadotunarafurenutu.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a6738792a---7103010080.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/7705506217.pdfIn PDF document text
    • http://elitvorota.ru/f/file/6697808787.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/db0f3b3b496db05e663b8b65e9f59570/wemapek.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/51384611919.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/pslifnji4u0h3dhm83lnbhr08f/59729353730.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/59852632590.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/76b8c034c9bb230c8e8f83898765a9b9/92916280326.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1520657d7dfa269d19787908afb44e5/vebigifupizula.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed9adf59b---8172882742.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/21387774499.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a488a3ef2---51212015467.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/fd1b195d75f9edf3944474ac7fe8c272/18211318038.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40d24b5d9---1711277953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=old+school+diary+of+a+wimpy+kid+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FED 16852 bytes
SHA-256: af625da40ebd09a265f45890f396b2ba35e63d5ce6c0a7a299f800c0372bef2a
font_02_sfnt_off00015bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAE 10868 bytes
SHA-256: ddfeed3399c23a2b448a8a8d0bee8f0dc92f079f8af4a91e567b4b57dc43c23e

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